[Bug]Previously installed Privacy Badger isn't enabled by default after migration, enabling it will send a notification on each app start

[AndiAJ]

Prerequisites

1. Have Fennec Nightly installed
2. Install Privacy Badger
3. Perform a migration to a Nightly Build with GV 76
4. Perform a migration to a Nightly Build with GV 77 (not the latest ❗ )
5. Perform a migration to the latest Nightly Build GV 77

Steps to reproduce

1. Open Fenix
2. Navigate to the Add-ons manager (check Privacy Badger's state)
3. If disabled, enable it and exit back to the Add-ons Manager
4. Open again Privacy Badger check the state
5. Close the app and re-open it

Expected behavior

Step 1 - An Add-on related notification should be displayed.
Step 2 - Privacy Badger should be enabled.
Step 4 - The disable/enable state should remain set as per the user's choice.
Step 5 - No Add-on related notification should be displayed again

Actual behavior

Step 2 - Privacy Badger is disabled
Step 3 & 4 - If you enable it, each time you re-open Privacy Badger it get's enabled over and over again
Step 5 - The Add-on related notification is displayed each time the user opens the app

Device information

• Android device:
  • Google Pixel 3a (Android 10)

• Fenix version: Nightly Build #21070609 from 4/16

Notes

► Video

┆Issue is synchronized with this Jira Task